[Bug 1920665] Re: Ubiquity crash on try/install and from live session with "malloc(): unaligned tcache chunk detected"

Sun Mar 21 13:29:56 UTC 2021

Some diagnosis as follows:

- Loaded a previous snapshot of a Kubuntu 21.04 VM from before 16th March 2021.
- Installed ubiquity.
- Tested whether ubiquity launches.
- Ubiquity launches.

- Then looked at what was upgradable in the release pocket.
- Sequentially upgraded likely culprits, rebooted, and tried to launch ubiquity after each small update.

Result:

Found that upgrading Mesa packages from 20.3.4-1 to 21.0.0-1 is all that
is required to trigger the crash.

Upgraded the following packages:
libegl-mesa0 (20.3.4-1) to 21.0.0-1
libgbm1 (20.3.4-1) to 21.0.0-1
libgl1-mesa-dri (20.3.4-1) to 21.0.0-1
libglapi-mesa (20.3.4-1) to 21.0.0-1
libglx-mesa0 (20.3.4-1) to 21.0.0-1
libxatracker2 (20.3.4-1) to 21.0.0-1
mesa-va-drivers (20.3.4-1) to 21.0.0-1
mesa-vdpau-drivers (20.3.4-1) to 21.0.0-1
mesa-vulkan-drivers (20.3.4-1) to 21.0.0-1

** Also affects: ubiquity (Ubuntu Hirsute)
   Importance: Critical
       Status: New

** Also affects: mesa (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1920665

Title:
  Ubiquity crash on try/install and from live session with "malloc():
  unaligned tcache chunk detected"

Status in mesa package in Ubuntu:
  New
Status in ubiquity package in Ubuntu:
  New
Status in mesa source package in Hirsute:
  New
Status in ubiquity source package in Hirsute:
  New

Bug description:
  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: ubiquity 21.04.11
  ProcVersionSignature: Ubuntu 5.11.0-11.12-generic 5.11.0
  Uname: Linux 5.11.0-11-generic x86_64
  ApportVersion: 2.20.11-0ubuntu60
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.460
  CurrentDesktop: KDE
  Date: Sun Mar 21 11:53:44 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20210321)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

  Since approximately 16/03/2021 ubiquity from maybe-ubiquity (try
  install screen) and from the live session is crashing on launch or
  shortly after.

  An example /var/log/installer/debug log from a session where both
  crashes were triggered is below.

  **** /var/log/installer/debug ****

Ubiquity 21.04.11
 TEXT If more than one person will use this computer, you can set up multiple accounts after installation.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 TEXT The name it uses when it talks to other computers.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 TEXT If more than one person will use this computer, you can set up multiple accounts after installation.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 TEXT The name it uses when it talks to other computers.
 QSocketNotifier: Invalid socket 17 and type 'Read', disabling...
 QSocketNotifier: Invalid socket 17 and type 'Write', disabling...
 QSocketNotifier: Invalid socket 17 and type 'Exception', disabling...
 Your console font configuration will be updated the next time your system
 boots. If you want to update it now, run 'setupcon' from a virtual console.
 update-initramfs is disabled since running on read-only media
 debconf: DbDriver "passwords" warning: could not open /var/cache/debconf/passwords.dat: Permission denied
 munmap_chunk(): invalid pointer
 Ubiquity 21.04.11
 QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
 QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
 QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-kubuntu'
 TEXT If more than one person will use this computer, you can set up multiple accounts after installation.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 TEXT The name it uses when it talks to other computers.
 TEXT Enter the same password twice, so that it can be checked for typing errors.
 malloc(): unaligned tcache chunk detected

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